Table 2.
Merkel cell carcinoma staging system, 2005 [40].
| Stage | TNM | OS 2 y | OS 5 y |
|---|---|---|---|
| Stage I | Primary < 2 cm (T1) | 67% | 81% |
| Stage II | Primary 2 cm or more (T2) | 59% | 67% |
| Stage III | Nodal disease (N1) | 49% | 52% |
| Stage IV | Systemic metastases (M1) | 23% | 11% |
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